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If cos7x-cos8x/1+2cos5x=cos(ax)-cos(bx ),where a, b are positive integers, then a²+b²=?? pls help! :(
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If cos7x-cos8x/1+2cos5x=cos(ax)-cos(bx ),where a, b are positive integers, then a²+b²=??
pls help!...
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